我是目标C的新程序员.我在Objective C中添加了一些html文件.在这个html文件中包含简单的javascript函数.我需要通过目标C代码调用该函数.我通过谷歌尝试了很多时间.但我找不到真正的方法来做到这一点.Bellow包含html文件:
<!DOCTYPE html>
<html>
<head>
<script>
function myFunction()
{
alert("Hello World!");
}
</script>
</head>
<body>
<button onclick="myFunction()">Try it</button>
</body>
</html>
我这样调用这个函数:是正确还是错误？如果错了,该怎么做.请帮忙.
NSString *path;
NSBundle *thisBundle = [NSBundle mainBundle];
path = [thisBundle pathForResource:@"first" ofType:@"html"];
NSURL *instructionsURL = [NSURL fileURLWithPath:path];
[webView loadRequest:[NSURLRequest requestWithURL:instructionsURL]];
NSString * jsCallBack = [NSString stringWithFormat:@"myFunction()"];
[webView stringByEvaluatingJavaScriptFromString:jsCallBack];
[webView stringByEvaluatingJavaScriptFromString:@"myFunction()"];
Ser*_*tov 30
NSString *path;
NSBundle *thisBundle = [NSBundle mainBundle];
path = [thisBundle pathForResource:@"first" ofType:@"html"];
NSURL *instructionsURL = [NSURL fileURLWithPath:path];
[webView loadRequest:[NSURLRequest requestWithURL:instructionsURL]];
NSString * jsCallBack = [NSString stringWithFormat:@"myFunction()"];
[webView stringByEvaluatingJavaScriptFromString:jsCallBack];
[webView stringByEvaluatingJavaScriptFromString:@"myFunction()"];
如果从单个位置调用所有这些代码,那么它将无法工作,因为页面加载是异步的,并且当时没有准备好带有JavaScript代码的页面.尝试[webView stringByEvaluatingJavaScriptFromString:@"myFunction()"];在UIWebViewDelegate回调方法中调用此方法–webViewDidFinishLoad:
uma*_*nta 11
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript" charset="utf-8" src="your.js"></script>
<script type="text/javascript" charset="utf-8" src="andYourJsfileName.js"></script>
<script>
function myFunction('yourParameter')
{
// do your javascript operation
//alert("my Hello World!");
return value;
}
</script>
</head>
<body>
<!--button onclick="myFunction()">Try it</button-->
</body>
将html文件添加到项目文件夹.将您的javascript文件也添加到项目文件夹中.
将html文件和此本机代码添加到viewController.m后
-(void)loadMyWebView {
webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 100, 200)];
NSString *path;
NSBundle *thisBundle = [NSBundle mainBundle];
path = [thisBundle pathForResource:@"first" ofType:@"html"];
NSURL *instructionsURL = [NSURL fileURLWithPath:path];
NSString* htmlString = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
webView.delegate=self;
[webView loadHTMLString:htmlString baseURL:instructionsURL];
// [self.view addSubview:webView]; (if you want to access the javascript function and don't want to add webview, you can skip that also.)
}
- (void)webViewDidFinishLoad:(UIWebView*)theWebView {
NSString* returnValue =[theWebView stringByEvaluatingJavaScriptFromString:@"myFunction('pass your parameter')"];
NSLog(@"returnValue = %@ ",returnValue);
}
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{
NSLog(@" didFailLoadWithError");
}
在didLoad方法中调用它 [self loadMyWebView];
在这里,您可以将任何javascript文件添加到项目中,并将其包含在html文件中.你可以在标签内调用javascript函数.(就像你以前调用js函数一样.)
您可以将任何参数传递给javascript函数并将任何内容返回给目标函数.
记住::: 添加所有js文件后不要忘记将它们添加到Copy Bundle Resources
为了避免警告::: 从Compile Sources中删除它们
可以使用JavaScriptCore框架从Objective-C运行JavaScript代码.
#import <JavaScriptCore/JavaScriptCore.h>
...
JSContext *context = [[JSContext alloc] init];
[context evaluateScript: @"function greet(name){ return 'Hello, ' + name; }"];
JSValue *function = context[@"greet"];
JSValue* result = [function callWithArguments:@[@"World"]];
[result toString]; // -> Hello, World
这是一个演示:
https://github.com/evgenyneu/ios-javascriptcore-demo
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